Geochemical evaluation of CO2 injection into storage reservoirs based on case-studies in The Netherlands
conference paper
Over the past few years several geochemical evaluations of CO2 storage in Dutch potential reservoirs are carried out, including predictions of the short- and long-term impact of CO2 on the reservoir using geochemical modelling. The initial mineralogy of the reservoir is frequently obtained from core analysis and is then used to compute the formation water composition. In this paper geochemical modelling with TOUGHREACT is used to predict and compare the short- and long-term geochemical impact of CO 2 injection into three reservoirs. The mineralogical composition of these reservoirs is an assemblage based on commonly observed minerals from the Buntsandstein and Rotliegend formations. These formations contain potential onshore and offshore CO2 storage locations in the Netherlands. The results predict drying out and salt precipitation in the near-well area, due to water evaporation by the injected dry CO2. Several mineral transformations are predicted, dominated by the transformation of albite into dawsonite, thereby fixing CO2. Due to the relatively low density of dawsonite, the porosity significantly decreases, which can lead to a pore pressure increase. Disabling of dawsonite precipitation in the simulations, thereby taking into account the ongoing debate on dawsonite stability, only shows a small increase of the porosity. Future (experimental) work should be focused on dawsonite occurrence for accurate predictions of the long-term reservoir integrity. © 2011 Published by Elsevier Ltd.
Topics
CCSCO2 storageDawsoniteGeochemical modellingGeochemistryAccurate predictionCase-studiesCCSCO storageDawsoniteFormation waterGeochemical modellingLow densityMineral transformationsMineralogical compositionsNetherlandsPotential reservoirPressure increaseSalt precipitationStorage locationStorage reservoirsTOUGHREACTWater evaporationCrystallographyForecastingGlobal warmingGreenhouse gasesMineralogyMineralsPetroleum reservoir evaluationPrecipitation (chemical)Water injectionAnalytical geochemistry
TNO Identifier
429719
ISSN
18766102
Source title
10th International Conference on Greenhouse Gas Control Technologies, 19 September 2010 through 23 September 2010, Amsterdam. Conference code: 84600
Pages
4747-4753
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